<!DOCTYPE html><html lang="[&quot;zh-Hans&quot;,&quot;zh-CN&quot;,&quot;default&quot;]"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1"><meta name="description" content="byte[]和string及16进制的转换"><meta name="keywords" content="byte"><meta name="author" content="wenmu"><meta name="copyright" content="wenmu"><title>byte[]和string及16进制的转换 | 温木的博客</title><link rel="shortcut icon" href="/melody-favicon.ico"><link rel="stylesheet" href="/css/index.css?version=1.6.1"><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/font-awesome@latest/css/font-awesome.min.css?version=1.6.1"><link rel="dns-prefetch" href="https://cdn.staticfile.org"><link rel="dns-prefetch" href="https://cdn.bootcss.com"><link rel="dns-prefetch" href="https://creativecommons.org"><link rel="dns-prefetch" href="http://ta.qq.com"><script>(function() {
   var hm = document.createElement("script");
   hm.src = "https://tajs.qq.com/stats?sId=&lt;script type=&quot;text/javascript&quot; src=&quot;http://tajs.qq.com/stats?sId=66523541&quot; charset=&quot;UTF-8&quot;&gt;&lt;/script&gt;";
   var s = document.getElementsByTagName("script")[0];
   s.parentNode.insertBefore(hm, s);
 })();</script><script>var GLOBAL_CONFIG = { 
  root: '/',
  algolia: undefined,
  localSearch: undefined,
  copy: {
    success: '复制成功',
    error: '复制错误',
    noSupport: '浏览器不支持'
  }
} </script><meta name="generator" content="Hexo 4.2.0"></head><body><i class="fa fa-arrow-right" id="toggle-sidebar" aria-hidden="true"></i><div id="sidebar"><div class="toggle-sidebar-info text-center"><span data-toggle="切换文章详情">切换站点概览</span><hr></div><div class="sidebar-toc"><div class="sidebar-toc__title">目录</div><div class="sidebar-toc__progress"><span class="progress-notice">你已经读了</span><span class="progress-num">0</span><span class="progress-percentage">%</span><div class="sidebar-toc__progress-bar"></div></div><div class="sidebar-toc__content"></div></div><div class="author-info hide"><div class="author-info__avatar text-center"><img src="https://i.loli.net/2020/02/27/xwaBoOj158MfNyq.jpg"></div><div class="author-info__name text-center">wenmu</div><div class="author-info__description text-center">记录一些在工作中或学习新知识时学到的一些知识点；正所谓好记性不如一个烂笔头，温故而知新！</div><hr><div class="author-info-articles"><a class="author-info-articles__archives article-meta" href="/archives"><span class="pull-left">文章</span><span class="pull-right">115</span></a><a class="author-info-articles__tags article-meta" href="/tags"><span class="pull-left">标签</span><span class="pull-right">52</span></a><a class="author-info-articles__categories article-meta" href="/categories"><span class="pull-left">分类</span><span class="pull-right">30</span></a></div></div></div><div id="content-outer"><div class="no-bg" id="top-container"><div id="page-header"><span class="pull-left"> <a id="site-name" href="/">温木的博客</a></span><i class="fa fa-bars toggle-menu pull-right" aria-hidden="true"></i><span class="pull-right menus"><a class="site-page" href="/">首页</a><a class="site-page" href="/archives">文章</a><a class="site-page" href="/tags">标签</a><a class="site-page" href="/categories">分类</a></span></div><div id="post-info"><div id="post-title">byte[]和string及16进制的转换</div><div id="post-meta"><time class="post-meta__date"><i class="fa fa-calendar" aria-hidden="true"></i> 2020-01-09</time><span class="post-meta__separator">|</span><i class="fa fa-inbox post-meta__icon" aria-hidden="true"></i><a class="post-meta__categories" href="/categories/JavaScript/">JavaScript</a></div></div></div><div class="layout" id="content-inner"><article id="post"><div class="article-container" id="post-content"><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 字符串转换成byte[]</span></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">stringToByte</span>(<span class="params">str</span>) </span>&#123;</span><br><span class="line">  <span class="keyword">var</span> bytes = <span class="keyword">new</span> <span class="built_in">Array</span>();</span><br><span class="line">  <span class="keyword">var</span> len, c;</span><br><span class="line">  len = str.length;</span><br><span class="line">  <span class="keyword">for</span> (<span class="keyword">var</span> i = <span class="number">0</span>; i &lt; len; i++) &#123;</span><br><span class="line">    c = str.charCodeAt(i);</span><br><span class="line">    <span class="keyword">if</span> (c &gt;= <span class="number">0x010000</span> &amp;&amp; c &lt;= <span class="number">0x10ffff</span>) &#123;</span><br><span class="line">      bytes.push(((c &gt;&gt; <span class="number">18</span>) &amp; <span class="number">0x07</span>) | <span class="number">0xf0</span>);</span><br><span class="line">      bytes.push(((c &gt;&gt; <span class="number">12</span>) &amp; <span class="number">0x3f</span>) | <span class="number">0x80</span>);</span><br><span class="line">      bytes.push(((c &gt;&gt; <span class="number">6</span>) &amp; <span class="number">0x3f</span>) | <span class="number">0x80</span>);</span><br><span class="line">      bytes.push((c &amp; <span class="number">0x3f</span>) | <span class="number">0x80</span>);</span><br><span class="line">    &#125; <span class="keyword">else</span> <span class="keyword">if</span> (c &gt;= <span class="number">0x000800</span> &amp;&amp; c &lt;= <span class="number">0x00ffff</span>) &#123;</span><br><span class="line">      bytes.push(((c &gt;&gt; <span class="number">12</span>) &amp; <span class="number">0x0f</span>) | <span class="number">0xe0</span>);</span><br><span class="line">      bytes.push(((c &gt;&gt; <span class="number">6</span>) &amp; <span class="number">0x3f</span>) | <span class="number">0x80</span>);</span><br><span class="line">      bytes.push((c &amp; <span class="number">0x3f</span>) | <span class="number">0x80</span>);</span><br><span class="line">    &#125; <span class="keyword">else</span> <span class="keyword">if</span> (c &gt;= <span class="number">0x000080</span> &amp;&amp; c &lt;= <span class="number">0x0007ff</span>) &#123;</span><br><span class="line">      bytes.push(((c &gt;&gt; <span class="number">6</span>) &amp; <span class="number">0x1f</span>) | <span class="number">0xc0</span>);</span><br><span class="line">      bytes.push((c &amp; <span class="number">0x3f</span>) | <span class="number">0x80</span>);</span><br><span class="line">    &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">      bytes.push(c &amp; <span class="number">0xff</span>);</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">  <span class="keyword">return</span> bytes;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">// byte[]转换成字符串</span></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">byteToString</span>(<span class="params">arr</span>) </span>&#123;</span><br><span class="line">  <span class="keyword">if</span> (<span class="keyword">typeof</span> arr === <span class="string">"string"</span>) &#123;</span><br><span class="line">    <span class="keyword">return</span> arr;</span><br><span class="line">  &#125;</span><br><span class="line">  <span class="keyword">var</span> str = <span class="string">""</span>,</span><br><span class="line">    _arr = arr;</span><br><span class="line">  <span class="keyword">for</span> (<span class="keyword">var</span> i = <span class="number">0</span>; i &lt; _arr.length; i++) &#123;</span><br><span class="line">    <span class="keyword">var</span> one = _arr[i].toString(<span class="number">2</span>),</span><br><span class="line">      v = one.match(<span class="regexp">/^1+?(?=0)/</span>);</span><br><span class="line">    <span class="keyword">if</span> (v &amp;&amp; one.length == <span class="number">8</span>) &#123;</span><br><span class="line">      <span class="keyword">var</span> bytesLength = v[<span class="number">0</span>].length;</span><br><span class="line">      <span class="keyword">var</span> store = _arr[i].toString(<span class="number">2</span>).slice(<span class="number">7</span> - bytesLength);</span><br><span class="line">      <span class="keyword">for</span> (<span class="keyword">var</span> st = <span class="number">1</span>; st &lt; bytesLength; st++) &#123;</span><br><span class="line">        store += _arr[st + i].toString(<span class="number">2</span>).slice(<span class="number">2</span>);</span><br><span class="line">      &#125;</span><br><span class="line">      str += <span class="built_in">String</span>.fromCharCode(<span class="built_in">parseInt</span>(store, <span class="number">2</span>));</span><br><span class="line">      i += bytesLength - <span class="number">1</span>;</span><br><span class="line">    &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">      str += <span class="built_in">String</span>.fromCharCode(_arr[i]);</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">  <span class="keyword">return</span> str;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">//十六进制字符串转字节数组，跟网上demo一样</span></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">HexString2Bytes</span>(<span class="params">str</span>) </span>&#123;</span><br><span class="line">  <span class="keyword">var</span> pos = <span class="number">0</span>;</span><br><span class="line">  <span class="keyword">var</span> len = str.length;</span><br><span class="line">  <span class="keyword">if</span> (len % <span class="number">2</span> != <span class="number">0</span>) &#123;</span><br><span class="line">    <span class="keyword">return</span> <span class="literal">null</span>;</span><br><span class="line">  &#125;</span><br><span class="line">  len /= <span class="number">2</span>;</span><br><span class="line">  <span class="keyword">var</span> arrBytes = <span class="keyword">new</span> <span class="built_in">Array</span>();</span><br><span class="line">  <span class="keyword">for</span> (<span class="keyword">var</span> i = <span class="number">0</span>; i &lt; len; i++) &#123;</span><br><span class="line">    <span class="keyword">var</span> s = str.substr(pos, <span class="number">2</span>);</span><br><span class="line">    <span class="keyword">var</span> v = <span class="built_in">parseInt</span>(s, <span class="number">16</span>);</span><br><span class="line">    arrBytes.push(v);</span><br><span class="line">    pos += <span class="number">2</span>;</span><br><span class="line">  &#125;</span><br><span class="line">  <span class="keyword">return</span> arrBytes;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">//字节数组转十六进制字符串，对负值填坑</span></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">Bytes2HexString</span>(<span class="params">arrBytes</span>) </span>&#123;</span><br><span class="line">  <span class="keyword">var</span> str = <span class="string">""</span>;</span><br><span class="line">  <span class="keyword">for</span> (<span class="keyword">var</span> i = <span class="number">0</span>; i &lt; arrBytes.length; i++) &#123;</span><br><span class="line">    <span class="keyword">var</span> tmp;</span><br><span class="line">    <span class="keyword">var</span> num = arrBytes[i];</span><br><span class="line">    <span class="keyword">if</span> (num &lt; <span class="number">0</span>) &#123;</span><br><span class="line">      <span class="comment">//此处填坑，当byte因为符合位导致数值为负时候，需要对数据进行处理</span></span><br><span class="line">      tmp = (<span class="number">255</span> + num + <span class="number">1</span>).toString(<span class="number">16</span>);</span><br><span class="line">    &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">      tmp = num.toString(<span class="number">16</span>);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">if</span> (tmp.length == <span class="number">1</span>) &#123;</span><br><span class="line">      tmp = <span class="string">"0"</span> + tmp;</span><br><span class="line">    &#125;</span><br><span class="line">    str += tmp;</span><br><span class="line">  &#125;</span><br><span class="line">  <span class="keyword">return</span> str;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</div></article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">文章作者: </span><span class="post-copyright-info"><a href="mailto:undefined">wenmu</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">文章链接: </span><span class="post-copyright-info"><a href="http://blog.wangpengpeng.site/2020/01/09/byte-%E5%92%8Cstring%E5%8F%8A16%E8%BF%9B%E5%88%B6%E7%9A%84%E8%BD%AC%E6%8D%A2/">http://blog.wangpengpeng.site/2020/01/09/byte-%E5%92%8Cstring%E5%8F%8A16%E8%BF%9B%E5%88%B6%E7%9A%84%E8%BD%AC%E6%8D%A2/</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">版权声明: </span><span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank" rel="noopener">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来自 <a href="http://blog.wangpengpeng.site">温木的博客</a>！</span></div></div><div class="post-meta__tag-list"><a class="post-meta__tags" href="/tags/byte/">byte</a></div><div class="post-qr-code"><div class="post-qr-code-item"><img class="post-qr-code__img" src="https://i.loli.net/2020/02/27/hOBzIxFDJMCrmtN.jpg"><div class="post-qr-code__desc">微信打赏</div></div></div><nav id="pagination"><div class="prev-post pull-left"><a href="/2020/01/09/JavaScript%E4%B8%AD%E5%8F%98%E9%87%8F%E5%92%8C%E5%87%BD%E6%95%B0%E7%9A%84%E5%A3%B0%E6%98%8E%E6%8F%90%E5%89%8D/"><i class="fa fa-chevron-left">  </i><span>JavaScript中变量和函数的声明提前</span></a></div><div class="next-post pull-right"><a href="/2020/01/09/create-react-app%E6%B7%BB%E5%8A%A0mocker%E5%92%8C%E4%BB%A3%E7%90%86%E5%8A%9F%E8%83%BD/"><span>create-react-app添加mocker和代理功能</span><i class="fa fa-chevron-right"></i></a></div></nav><div id="vcomment"></div><script src="https://cdn1.lncld.net/static/js/3.0.4/av-min.js"></script><script src="https://cdn.jsdelivr.net/npm/valine/dist/Valine.min.js"></script><script>var notify = 'false' == true ? true : false;
var verify = 'false' == true ? true : false;
var GUEST_INFO = ['nick','mail','link'];
var guest_info = 'nick,mail,link'.split(',').filter(function(item){
  return GUEST_INFO.indexOf(item) > -1
});
guest_info = guest_info.length == 0 ? GUEST_INFO :guest_info;
window.valine = new Valine({
  el:'#vcomment',
  notify:notify,
  verify:verify,
  appId:'U1QqpeQNuBnRsfygHk1GQ30q-gzGzoHsz',
  appKey:'dunDQzEseDzgsKgw4qLQcog1',
  placeholder:'支持markdown！',
  avatar:'wavatar',
  guest_info:guest_info,
  pageSize:'20',
  lang: 'zh-cn'
})</script></div></div><footer><div class="layout" id="footer"><div class="copyright">&copy;2019 - 2020 By wenmu</div><div class="framework-info"><span>驱动 - </span><a href="http://hexo.io" target="_blank" rel="noopener"><span>Hexo</span></a><span class="footer-separator">|</span><span>主题 - </span><a href="https://github.com/Molunerfinn/hexo-theme-melody" target="_blank" rel="noopener"><span>Melody</span></a></div><div class="busuanzi"><script async src="//busuanzi.ibruce.info/busuanzi/2.3/busuanzi.pure.mini.js"></script><span id="busuanzi_container_page_pv">该文访问量<span id="busuanzi_value_page_pv"></span><span></span></span></div></div></footer><i class="fa fa-arrow-up" id="go-up" aria-hidden="true"></i><script src="https://cdn.jsdelivr.net/npm/animejs@latest/anime.min.js"></script><script src="https://cdn.jsdelivr.net/npm/jquery@latest/dist/jquery.min.js"></script><script src="https://cdn.jsdelivr.net/npm/@fancyapps/fancybox@latest/dist/jquery.fancybox.min.js"></script><script src="https://cdn.jsdelivr.net/npm/velocity-animate@latest/velocity.min.js"></script><script src="https://cdn.jsdelivr.net/npm/velocity-ui-pack@latest/velocity.ui.min.js"></script><script src="/js/utils.js?version=1.6.1"></script><script src="/js/fancybox.js?version=1.6.1"></script><script src="/js/sidebar.js?version=1.6.1"></script><script src="/js/copy.js?version=1.6.1"></script><script src="/js/fireworks.js?version=1.6.1"></script><script src="/js/transition.js?version=1.6.1"></script><script src="/js/scroll.js?version=1.6.1"></script><script src="/js/head.js?version=1.6.1"></script><script>if(/Android|webOS|iPhone|iPod|BlackBerry/i.test(navigator.userAgent)) {
  $('#nav').addClass('is-mobile')
  $('footer').addClass('is-mobile')
}</script></body></html>